code: def test_violin_single(self):
      violin = Violin([1, 1, 2, 3, 3, 4, 5, 5])
      state = self._get_plot_state(violin)
      self.assertEqual(len(state["data"]), 1)
      self.assertEqual(state["data"][0]["type"], "violin")
      self.assertEqual(state["data"][0]["name"], "")
      self.assertEqual(
          state["data"][0]["y"], np.array([1, 1, 2, 3, 3, 4, 5, 5])
      )
      self.assertEqual(state["layout"].get("xaxis", {}), {})
      self.assertEqual(state["layout"]["yaxis"]["range"], [1, 5])
      self.assertEqual(state["layout"]["yaxis"]["title"]["text"], "y")
  
file_path: holoviews/holoviews/tests/plotting/plotly/test_violinplot.py
imports: import numpy
  from holoviews.element import Violin
  from .test_plot import TestPlotlyPlot
label_desc: Use image node_id 1 for calling the TestViolinPlot obj's underlying member method code with example usage: obj.test_violin_single() without return types